feat: add props system and refactor asset library architecture

tests/unit/assets/registry.test.ts

@@ -0,0 +1,44 @@
+import { describe, expect, it } from 'vitest'
+import { assetKindRegistry, getAssetKindRegistration } from '@/lib/assets/kinds/registry'
+
+describe('asset kind registry', () => {
+  it('declares the supported asset kinds with stable capability contracts', () => {
+    expect(Object.keys(assetKindRegistry)).toEqual(['character', 'location', 'prop', 'voice'])
+    expect(getAssetKindRegistration('character')).toEqual(expect.objectContaining({
+      kind: 'character',
+      family: 'visual',
+      supportsMultipleVariants: true,
+      supportsVoiceBinding: true,
+      capabilities: expect.objectContaining({
+        canGenerate: true,
+        canBindVoice: true,
+      }),
+    }))
+    expect(getAssetKindRegistration('location')).toEqual(expect.objectContaining({
+      kind: 'location',
+      family: 'visual',
+      supportsMultipleVariants: true,
+      supportsVoiceBinding: false,
+    }))
+    expect(getAssetKindRegistration('prop')).toEqual(expect.objectContaining({
+      kind: 'prop',
+      family: 'visual',
+      supportsMultipleVariants: true,
+      supportsVoiceBinding: false,
+      capabilities: expect.objectContaining({
+        canGenerate: true,
+        canSelectRender: true,
+        canCopyFromGlobal: true,
+      }),
+    }))
+    expect(getAssetKindRegistration('voice')).toEqual(expect.objectContaining({
+      kind: 'voice',
+      family: 'audio',
+      supportsMultipleVariants: false,
+      capabilities: expect.objectContaining({
+        canGenerate: false,
+        canSelectRender: false,
+      }),
+    }))
+  })
+})